package com.mmal.example.singleton;

import com.mmal.annotation.Recommend;
import com.mmal.annotation.ThreadSafe;

/**
 * 枚举模式
 */
@ThreadSafe
@Recommend
public class SingletonExample7 {

    // 私有的构造函数
    private SingletonExample7() {
    }

    public static SingletonExample7 getInstance(){
        return Singleton.INSTANCE.getInstance();
    }

    private enum Singleton{
        INSTANCE;

        private SingletonExample7 singleton;

        // JVM保证这个方法绝对只调用一次
        Singleton(){
            singleton = new SingletonExample7();
        }

        public SingletonExample7 getInstance(){
            return singleton;
        }
    }



}
